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Re: [Qemu-devel] [Xen-devel] [PATCH] Add Xen platform PCI device version

From: Alex Bligh
Subject: Re: [Qemu-devel] [Xen-devel] [PATCH] Add Xen platform PCI device version 2.
Date: Thu, 20 Jun 2013 09:08:36 +0100

--On 20 June 2013 07:47:12 +0000 Paul Durrant <address@hidden> wrote:

If someone has a VM that has the old Citrix drivers installed, or GPLPV,
I think I should be able to spot this and make sure that the new bus
driver quiesces itself to prevent strangeness ensuing. If and when said
previous drivers are un-installed then the new bus driver can wake up and
enumerate the device nodes for the other pv drivers and Windows Update
can carry on doing its stuff.

I have no clue about Windows device drivers, so this may be a silly
suggestion. If your suggestion above already requires a Xen code change,
one possibility might be copy the idea behind the PCI unplug logic. Either
if the new PCI device is used, it could unplug the old one, or vice versa.
Drivers magically unplugging themselves may not be ideal, but it beats
having 2 drivers fighting over the same device.

Alex Bligh

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